1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184

mod inner;
mod read;
mod write;

pub use self::{read::FramedRead, write::FramedWrite};

use self::inner::{FramedInner, RWFrames, ReadFrame, WriteFrame};
use crate::{
    codec::{Decoder, Encoder},
    error::Error,
};
pub use bytes::{Bytes, BytesMut};
use futures_core::Stream;
use futures_io::{AsyncRead, AsyncWrite};
use futures_sink::Sink;
use pin_project_lite::pin_project;
use std::{
    fmt,
    pin::Pin,
    task::{Context, Poll},
};

pin_project! {
    pub struct Framed<T, U> {
        #[pin]
        inner: FramedInner<T, U, RWFrames>
    }
}

impl<T, U> Framed<T, U> {
    pub fn new(inner: T, codec: U) -> Framed<T, U> {
        Framed {
            inner: FramedInner {
                inner,
                codec,
                state: Default::default(),
            },
        }
    }

    pub fn with_capacity(inner: T, codec: U, capacity: usize) -> Framed<T, U> {
        Framed {
            inner: FramedInner {
                inner,
                codec,
                state: RWFrames {
                    read: ReadFrame {
                        buffer: BytesMut::with_capacity(capacity),
                    },
                    write: WriteFrame::default(),
                },
            },
        }
    }

    pub fn from_parts(parts: FramedParts<T, U>) -> Framed<T, U> {
        Framed {
            inner: FramedInner {
                inner: parts.io,
                codec: parts.codec,
                state: RWFrames {
                    read: parts.read_buf.into(),
                    write: parts.write_buf.into(),
                },
            },
        }
    }

    pub fn get_ref(&self) -> &T {
        &self.inner.inner
    }

    pub fn get_mut(&mut self) -> &mut T {
        &mut self.inner.inner
    }

    pub fn get_pin_mut(self: Pin<&mut Self>) -> Pin<&mut T> {
        self.project().inner.project().inner
    }

    pub fn codec(&self) -> &U {
        &self.inner.codec
    }

    pub fn codec_mut(&mut self) -> &mut U {
        &mut self.inner.codec
    }

    pub fn read_buffer(&self) -> &BytesMut {
        &self.inner.state.read.buffer
    }

    pub fn read_buffer_mut(&mut self) -> &mut BytesMut {
        &mut self.inner.state.read.buffer
    }

    pub fn into_inner(self) -> T {
        self.inner.inner
    }

    pub fn into_parts(self) -> FramedParts<T, U> {
        FramedParts {
            io: self.inner.inner,
            codec: self.inner.codec,
            read_buf: self.inner.state.read.buffer,
            write_buf: self.inner.state.write.buffer,
            _priv: (),
        }
    }
}

impl<T, U> Stream for Framed<T, U>
where
    T: AsyncRead,
    U: Decoder,
{
    type Item = Result<U::Item, Error<U::Error>>;

    fn poll_next(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
        self.project().inner.poll_next(cx)
    }
}

impl<T, U> Sink<U::Item> for Framed<T, U>
where
    T: AsyncWrite,
    U: Encoder,
{
    type Error = Error<U::Error>;

    fn poll_ready(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
        self.project().inner.poll_ready(cx)
    }

    fn start_send(self: Pin<&mut Self>, item: U::Item) -> Result<(), Self::Error> {
        self.project().inner.start_send(item)
    }

    fn poll_flush(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
        self.project().inner.poll_flush(cx)
    }

    fn poll_close(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
        self.project().inner.poll_close(cx)
    }
}

impl<T, U> fmt::Debug for Framed<T, U>
where
    T: fmt::Debug,
    U: fmt::Debug,
{
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        f.debug_struct("Framed")
            .field("io", self.get_ref())
            .field("codec", self.codec())
            .finish()
    }
}

#[derive(Debug)]
#[allow(clippy::manual_non_exhaustive)]
pub struct FramedParts<T, U> {
    pub io: T,
    pub codec: U,
    pub read_buf: BytesMut,
    pub write_buf: BytesMut,
    _priv: (),
}

impl<T, U> FramedParts<T, U> {
    pub fn new<I>(io: T, codec: U) -> FramedParts<T, U>
    where
        U: Encoder,
    {
        FramedParts {
            io,
            codec,
            read_buf: BytesMut::new(),
            write_buf: BytesMut::new(),
            _priv: (),
        }
    }
}